Hi manish
You are confusing me ! you want design a circuit . it is ok . but how much power ? what frequency ? for what application ? how much Irpp ? how about Vrpp ? why DCM ? can you show me the circuit that you have in your mind , please ? thus i will have a back ground about what circuit you are trying to design . because there are many kind of buck-boost converters available . don't forget that when you want ask a question you should give enough informations to get best answers .
Best Wishes
Goldsmith